Event Horizon Telescope (EHT) is a largest telescope system consisting of global telescope system. It captures a greatest image of this century a real black hole image, it collects and combine all the data from several very long base interferometry VLBS ( an astronomical interferometry that used to collect and manipulate data from astronomical source such as quasar etc ), station all over the earth to get high resolution which is sufficient to observe the astronomical objects. The main objective of this mission is to observe the two black holes one with the largest angular diameter as observed from Earth: the black hole at the center of the super giant elliptical galaxy Messier 87 (M87), and and Sagittarius A* (Sgr A*) at the center of our Milky Way galaxy.
The Event Horizon Telescope (EHT) is composed of nearly 8 radio observatories all over the world, working together to produce high angular resolution image of the astronomical objects. The mechanism of VLBS is very simple, each antenna of the telescope spread out to a vast distance, and it has very precise atomic clock devices to provide fine time signals, these antennas collect analogue signal and then it convert it into digital signals and store these on hard drives along with correct time signal provided by atomic clocks. later these signals are shipped to central processor and synchronized. An astronomical observation image is obtained by processing the data gathered from multiple locations.
Data collected on hard drives are transported by commercial freight airplanes from the various telescopes to the MIT Haystack Observatory and the Max Planck Institute for Radio Astronomy, where the data are cross-correlated and analyzed on a grid computer made from about 800 CPUs all connected through a 40 Gbit/s network.
The first success is the direct image of the super massive black holes at the center of Messier 87, (M87). The scientific results were presented in a series of six papers published in The Astrophysical Journal Letters.
A TEST FOR GENERAL THEORY OF RELATIVITY
Studies have previously tested general relativity by looking at the motions of stars and gas clouds near the edge of a black hole. But, the first image of black hole in Messier 87, brings observation very closer to black hole's event horizons. Einstein theory of relativity predict that the dark shadow like region is caused due to the gravitational bending and capturing of visible radiation and the first ever image of black hole also matches the same, hence theory of relativity is once again verified.
The image also provided new measurements for the mass and diameter of M87*. EHT measured the black hole's mass to be 6.5±0.7 billion solar masses and measured the diameter of its event horizon to be approximately 40 billion kilometres (270 AU; 0.0013 pc; 0.0042 ly), roughly 2.5 times smaller than the shadow that it casts, seen at the center of the image. In April 2020, the EHT released the first 20 microarcsecond resolution images of the archetypal blazar 3C 279 it observed in April 2017. These images, generated from observations over 4 nights in April 2017, reveal bright components of a jet whose projection on the observer plane exhibit apparent superluminal (faster then light ) motions with speeds up to 20 c , c is light constant where c = 2,99,792 metre per second.
Producing an image from data from an array of radio telescopes requires much mathematical work. Four independent teams created images to assess the reliability of the results. But, their hard work pays.
check out our article how we detect black holes
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| Soft X-ray image of Sagittarius A* (center) and two light echoes from a recent explosion (circled) |
Data collected on hard drives are transported by commercial freight airplanes from the various telescopes to the MIT Haystack Observatory and the Max Planck Institute for Radio Astronomy, where the data are cross-correlated and analyzed on a grid computer made from about 800 CPUs all connected through a 40 Gbit/s network.
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| First image of the shadow of a black hole (M87*) captured by the Event Horizon Telescope |
A TEST FOR GENERAL THEORY OF RELATIVITY
Studies have previously tested general relativity by looking at the motions of stars and gas clouds near the edge of a black hole. But, the first image of black hole in Messier 87, brings observation very closer to black hole's event horizons. Einstein theory of relativity predict that the dark shadow like region is caused due to the gravitational bending and capturing of visible radiation and the first ever image of black hole also matches the same, hence theory of relativity is once again verified.
The image also provided new measurements for the mass and diameter of M87*. EHT measured the black hole's mass to be 6.5±0.7 billion solar masses and measured the diameter of its event horizon to be approximately 40 billion kilometres (270 AU; 0.0013 pc; 0.0042 ly), roughly 2.5 times smaller than the shadow that it casts, seen at the center of the image. In April 2020, the EHT released the first 20 microarcsecond resolution images of the archetypal blazar 3C 279 it observed in April 2017. These images, generated from observations over 4 nights in April 2017, reveal bright components of a jet whose projection on the observer plane exhibit apparent superluminal (faster then light ) motions with speeds up to 20 c , c is light constant where c = 2,99,792 metre per second.
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| EHT image of the archetypal blazar 3C 279 showing a relativistic jet down to the AGN core surrounding the supermassive black hole |
Producing an image from data from an array of radio telescopes requires much mathematical work. Four independent teams created images to assess the reliability of the results. But, their hard work pays.
check out our article how we detect black holes
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